diff --git a/toolkit/components/passwordmgr/test/unit/test_disabled_hosts.js b/toolkit/components/passwordmgr/test/unit/test_disabled_hosts.js
index b49adbd5913c..4ec97be54ab2 100644
--- a/toolkit/components/passwordmgr/test/unit/test_disabled_hosts.js
+++ b/toolkit/components/passwordmgr/test/unit/test_disabled_hosts.js
@@ -143,55 +143,15 @@ add_task(function test_rememberSignons()
 });
 
 /**
- * Tests storing disabled hosts with non-ASCII characters where IDN is supported.
+ * Tests storing disabled hosts containing non-ASCII characters.
  */
-add_task(function* test_storage_setLoginSavingEnabled_nonascii_IDN_is_supported()
+add_task(function* test_storage_setLoginSavingEnabled_nonascii()
 {
-  let hostname = "http://大.net";
-  let encoding = "http://xn--pss.net";
-
-  // Test adding disabled host with nonascii URL (http://大.net).
+  let hostname = "http://" + String.fromCharCode(355) + ".example.com";
   Services.logins.setLoginSavingEnabled(hostname, false);
+
   yield* LoginTestUtils.reloadData();
-  Assert.equal(Services.logins.getLoginSavingEnabled(hostname), false);
-  Assert.equal(Services.logins.getLoginSavingEnabled(encoding), false);
-  LoginTestUtils.assertDisabledHostsEqual(Services.logins.getAllDisabledHosts(), [hostname]);
-
-  LoginTestUtils.clearData();
-
-  // Test adding disabled host with IDN ("http://xn--pss.net").
-  Services.logins.setLoginSavingEnabled(encoding, false);
-  yield* LoginTestUtils.reloadData();
-  Assert.equal(Services.logins.getLoginSavingEnabled(hostname), false);
-  Assert.equal(Services.logins.getLoginSavingEnabled(encoding), false);
-  LoginTestUtils.assertDisabledHostsEqual(Services.logins.getAllDisabledHosts(), [hostname]);
-
-  LoginTestUtils.clearData();
-});
-
-/**
- * Tests storing disabled hosts with non-ASCII characters where IDN is not supported.
- */
-add_task(function* test_storage_setLoginSavingEnabled_nonascii_IDN_not_supported()
-{
-  let hostname = "http://√.com";
-  let encoding = "http://xn--19g.com";
-
-  // Test adding disabled host with nonascii URL (http://√.com).
-  Services.logins.setLoginSavingEnabled(hostname, false);
-  yield* LoginTestUtils.reloadData();
-  Assert.equal(Services.logins.getLoginSavingEnabled(hostname), false);
-  Assert.equal(Services.logins.getLoginSavingEnabled(encoding), false);
-  LoginTestUtils.assertDisabledHostsEqual(Services.logins.getAllDisabledHosts(), [encoding]);
-
-  LoginTestUtils.clearData();
-
-  // Test adding disabled host with IDN ("http://xn--19g.com").
-  Services.logins.setLoginSavingEnabled(encoding, false);
-  yield* LoginTestUtils.reloadData();
-  Assert.equal(Services.logins.getLoginSavingEnabled(hostname), false);
-  Assert.equal(Services.logins.getLoginSavingEnabled(encoding), false);
-  LoginTestUtils.assertDisabledHostsEqual(Services.logins.getAllDisabledHosts(), [encoding]);
-
+  LoginTestUtils.assertDisabledHostsEqual(Services.logins.getAllDisabledHosts(),
+                                          [hostname]);
   LoginTestUtils.clearData();
 });